Elevator



1927' s. M. HALSTEAD ET A ELEVATOR Filed June 12, 192

FIGURE 2,

FIGURE 4:

I INVENTORS ZM fiw FIGURE 3 Patented Jan. 18, 1927.

STANLEY M. HALSTEAD AND ANTON I.

WIGKLAND, OF SAN JOSE, CALIFORNIA.

ELEVATOR.

Application filed June 12, 1926. Serial No. 115,542.

It is one object of the invention to provide an elevator of the character indicated that may be readily inserted in or removed from a fixed receptacle. imbedded in the ground without the necessity of making material mechanical alterations.

it is another object of the invention to provide a structure of the character indicated wherein the liquid used for applying force to the movable piston is contained wholly within the structure thereby obviat ing the necessity of providing an additional storage or pressure chamber.

It is also an object of the invention to provide a device of the character indicated including a reciprocating piston so constructed and arranged as to provide ample spaced bearings for the piston throughout its vertical movement whereby to prevent binding when elevated under a load.

It is still another object of the invention to provide an elevator of the character indi cated provided with independent reciprocating and rotating parts whereby to secure greater accuracy in operation and prolong its useful life.

In the drawing:

Figure 1 is a vertical transverse section of an elevator embodying our invention, part broken away.

Figure 2 is a plan View of the same, part broken away.

Figure 3 is a plan view of an other em bodiment of the invention, partly in section and part broken away.

Figure 4 is a vertical transverse section through a portion of another embodiment of the invention.

Referring now more particularly to the drawing, we show at 1 a cylinder of suitable dimensions fixedly imbedded in the ground 2. This cylinder has a wear ring 3 positioned within its upper edge as shown and is closed at its lower end by a cup-shaped memher 4 fitted with roller bearings 5.

A second hollow cylinder is shown at 6, this cylinder being of somewhat less diameter than the cylinder 1 and carrying a conical bottom piece 7 adapted to engage the bearing 5 and rotate thereon about a vertical axis common to the two cylinders. The upper end of the cylinder'G is fitted with a bearing member 8 having a central opening 9 formed therein and carrying a flange 10 extending outwardly from its upper edge to engage the ring 3 and rotate therein, the

said ring operating as a bearing there-for. At 11 is shown .a cylinder of less diameter than cylinder 6 and concentrically.positioned therein and spaced a distance from its lower end, the space between the two cylinders being filled with concrete as at 12. The upper end of the cylinder 11 is flared outwardly as at 13 to contact with cylinder 6 as shown.

At 14 we show a hollow piston carrying a head 15 at its lower end adapted to slidably engage the cylinder 11, the said piston extending upwardly through the opening 9 in member 8 and slidably engaging the said member and having a top member 16 fixedly mounted thereon. This top element may be of any suitable form, shape or size to carry the loads for which the elevator is designed,

and may have an opening as 17 in its upper end covered with a screen 19.

In the present embodiment of the invention we show a plate 20 fixedly mounted on piston 14 a distancebelow top 16 and carrying an electric motor 21 operated from a suitable source of supply not shown. To the motor 21 is connected a gear pump 22, and from the opposite sides of the pump extend pipes 23 and 24, the pipe 23 extending into the piston 14 and thence downwardly to a pomt near its lower end. The pipe 24 also extends into the piston 14 and then downwardly through the bottom end thereof to communicate with the interior of thecylinder 11.

The installation of this device is accomplished by first setting the cylinder 1 and parts carried thereby in the desired position in a suitable foundation. The balance of the structure being assembled as described it is lowered as a unit until its lower end rests upon the bearings 5. It may now be readily seen that the cylinder 6 may now be rotated as desired on bearings 5, the engaging parts 103 maintaining the cylinder in its true vertical position and permitting its rotation on the pivotal point or bearings 5, yet offering sufficient frictional resistance to prevent rotation of the cylinder 6 without some force being applied thereto.

The piston 14 may be moved'vertically with all the parts carried thereby, and is held in its true vertical position at all times through the positive engagement of the head 15 with cylinder 11 and the piston itself with hearing member 8. The positive engagement of these parts eflectually prevents the piston from rotating in the cylinder-11 because the offer greater frictional resistance than-t e engagements between the two cylinders 1 and 6.

To operate the device the piston is filled with a suitable liquid such as oil to a desired height as at 25. The motor 21 being put into operation, the oil is pumped from the piston 14 through pipes 23 and 24 and discharged into cylinder 11 below piston head 15, thereby causing the piston to rise.

The piston is lowered by reversing the motor and pumping the oil from cylinder 11 back into the piston 14.

There is no danger of suddendropping of the piston in this construction because the oil is pumped in bot-h directions, and the velocity of flow of the oil is greatly restricted by the use of comparatively small pipes.

In Figure 3 is shown a form of the invention where the upper end of the piston v is closed by the top 16, and the oil is forced through the pipes and out of the piston by air pressure entering through pipe 26, the oil passing through a check valve 27 in the direction indicated by arrow 28. The oil piston when By means of this construction pressure is secured or relieved in the cylinder 11 below the piston '14 without any pipe connections to the piston itself, without interferring with the revolving of cylinder 6 in cylinder 1, and without requiring special construction of the piston head.

It is to be understood, of course, that while we have herein shown and described certain embodiments of our invention, it is to be understood that changes in form, construction and method of operation may be made within the scope of the appended claims.

We claim 1. In combination, a vertically arranged and fixedly positioned hollow cylinder, a non-reciprocating hollow cylinder removably and revolubly mounted therein in concentric relation thereto, apiston mounted to reciprocate in said second cylinder and projecting from its upper end, and means for actuating said piston. k

2. In combination, a vertically arranged hollow cylinder, a non-reciprocating hollow cylinder revolubly mounted therein, and a piston operatively mounted to reciprocate in said second cylinder and projecting through the upper end thereof, and means for supporting a load on said piston.

3. In combination, a vertically arranged hollow cylinder, a non-reciprocating hollow cylinder revolubly mounted therein, a hollow piston operatively mounted to reciprocate in said second cylinder and projecting through the upper end thereof, means for supporting a load on said piston, a head on the lower end of said piston having frictional engagement with the second cylinder,

and means for introducing liquid under pressure alternately into the second cylinder below the piston head and into the piston.

4. In combination, a vertically arranged hollow cylinder, a non-reciprocating hollow cylinder revolubly mounted therein, ahollow piston operatively mounted to reciprocate in said second cylinder and projecting through the upper end thereof, means for supporting a load on said piston, a pump and actuating means therefor mounted on said piston, and conduits communicating with said pump and the interior of said piston and with the interior of the second cylinder below said piston.

STANLEY M. HALSTEAD. ANTON 1. WIOKLAND, 

